Update environment variables and enhance Docker configurations for improved deployment

- Modified .env.portainer to include new environment variables for S3 private bucket URL, Nostr JWT secrets, and SendGrid options.
- Updated docker-compose.yml to support the new environment variables, enhancing service configurations.
- Added a seed content script to the backend package.json for initializing the database with sample data.
- Refactored helper functions to construct S3 URLs more robustly, accommodating potential missing configurations.
- Enhanced dev.sh script to seed the database if empty, ensuring content availability during development.

docker-compose.yml

@@ -73,6 +73,7 @@ services:
       S3_PRIVATE_BUCKET_NAME: ${S3_PRIVATE_BUCKET:-indeedhub-private}
       S3_PUBLIC_BUCKET_NAME: ${S3_PUBLIC_BUCKET:-indeedhub-public}
       S3_PUBLIC_BUCKET_URL: ${S3_PUBLIC_BUCKET_URL}
+      S3_PRIVATE_BUCKET_URL: ${S3_PRIVATE_BUCKET_URL:-}
 
       # ── CloudFront (leave empty for MinIO/self-hosted) ──
       CLOUDFRONT_PRIVATE_KEY: ${CLOUDFRONT_PRIVATE_KEY:-}
@@ -89,6 +90,9 @@ services:
       # ── Nostr Auth / JWT ─────────────────────────────────
       NOSTR_JWT_SECRET: ${NOSTR_JWT_SECRET}
       NOSTR_JWT_EXPIRES_IN: ${NOSTR_JWT_EXPIRES_IN:-7d}
+      NOSTR_JWT_REFRESH_SECRET: ${NOSTR_JWT_REFRESH_SECRET:-}
+      NOSTR_JWT_TTL: ${NOSTR_JWT_TTL:-}
+      NOSTR_JWT_REFRESH_TTL: ${NOSTR_JWT_REFRESH_TTL:-}
 
       # ── AES-128 Content Encryption ──────────────────────
       AES_MASTER_SECRET: ${AES_MASTER_SECRET}
@@ -103,6 +107,7 @@ services:
       # ── SendGrid (optional -- alternative to SMTP) ──────
       SENDGRID_API_KEY: ${SENDGRID_API_KEY:-}
       SENDGRID_SENDER: ${SENDGRID_SENDER:-}
+      SENDGRID_WAITLIST: ${SENDGRID_WAITLIST:-}
 
       # ── Cognito (optional -- disabled with Nostr auth) ──
       COGNITO_USER_POOL_ID: ${COGNITO_USER_POOL_ID:-}
@@ -140,6 +145,10 @@ services:
       # ── Partner Content (optional) ──────────────────────
       PARTNER_API_BASE_URL: ${PARTNER_API_BASE_URL:-}
       PARTNER_API_KEY: ${PARTNER_API_KEY:-}
+
+      # ── Strike (optional -- alternative payment provider) ─
+      STRIKE_API_KEY: ${STRIKE_API_KEY:-}
+      STRIKE_WEBHOOK_KEY: ${STRIKE_WEBHOOK_KEY:-}
     depends_on:
       postgres:
         condition: service_healthy